Error "[] cannot be converted to JSON" when trying to create a JSON Object from String

Question

I'm using the Koltin language with GSON library to create/parse JSON. I have the following string that represents a JSON object

val jsonString = "{ \"age\": 22, \"height\" : 1.8, \"profession\":\"Student\", \"at_room\": false, \"gender\": \"male\",\"pictures\": []}"

When I try to convert this string to a JSON Object, by doing

val jsonData = JsonParser().parse(jsonString).asJsonObject

I get the following error:

[] can not be converted to JSON

I guess that this error is due to the fact that pictures is a JSONArray and not a primitive type. Anyway, I would like to know how to convert this string to a JSON Object correctly.

I don't think this deserves to have a Java tag, but don't you need to escape double quotes in your string? — OneCricketeer, May 07 '16 at 03:08
@cricket_007, I checked the JSON [here](http://jsonlint.com/). It's a valid JSON file — regmoraes, May 07 '16 at 03:11
I'm sure the JSON itself is valid, but you have double quotes within double quotes. Unless kotlin handles that somehow, you have to escape the quotes in the string — OneCricketeer, May 07 '16 at 03:13
There are examples of creating JSON objects here https://github.com/SalomonBrys/Kotson/blob/master/README.md — OneCricketeer, May 07 '16 at 03:14
@cricket_007, I'm using this library too :) , but the problem is that this String containing the JSON object is a server response, I'm just storing it in a `val` — regmoraes, May 07 '16 at 03:18
Okay, my only point was that I don't think your simple string in your question here is a valid string object — OneCricketeer, May 07 '16 at 03:23
http://stackoverflow.com/questions/7634518/getting-jsonobject-from-jsonarray this might help — Ashish Patil, May 07 '16 at 03:36

score 1 · Answer 1 · answered May 09 '16 at 08:18

Your code is fine, there is something else that is failing.

I've tried this and it works.

package proves

import com.google.gson.JsonParser

fun main(args: Array<String>) {
    val jsonString = "{ \"age\": 22, \"height\" : 1.8, \"profession\":\"Student\", \"at_room\": false, \"gender\": \"male\",\"pictures\": []}"
    val jsonData = JsonParser().parse(jsonString).asJsonObject
    print(jsonData)
}

Output:

{"age":22,"height":1.8,"profession":"Student","at_room":false,"gender":"male","pictures":[]}

Error "[] cannot be converted to JSON" when trying to create a JSON Object from String

1 Answers1